Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c0b8210ac28a2e…

MALICIOUS

PDF

65.4 KB Created: 2020-12-15 09:26:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2d7f7e3849c83a895e15f2e719a8373a SHA-1: 4cc2e3e693feaeaaca93a22c4460c74028a827ba SHA-256: d1c0b8210ac28a2e5cff20093c9e6c4dc6c776181e86ce551e0e1015a64ac426
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating a large number of external PDF links. The primary URL points to a domain often associated with SEO spam, and the PDF contains numerous links to other PDF files hosted on various platforms. This suggests a campaign focused on manipulating search engine results or distributing further malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffking.ru/123?utm_term=urban+dictionary+wig+split PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420030/normal_5fd09caf44dd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_5f97d78930fd9.pdfIn PDF document text
    • https://nipifofopofeduv.weebly.com/uploads/1/3/4/3/134338269/dcd240b0e7.pdfIn PDF document text
    • https://mikudone.weebly.com/uploads/1/3/4/3/134370159/virax-velipadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_5fb74a88f414c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_5fafbdbdd7be0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/77295f2c-8eed-406b-85ea-84edd9b0a468/28485833342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fd9b30-5f2a-4d74-a080-fee16c13f6eb/sinotojano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d582e06c-a55b-4228-b1df-9612d5e7c945/linitedexuzoburanevugog.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/xitusudobewusapoges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84699e4d-f2b7-4ddb-a5cb-42b64bc059f3/9913297952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e46904e-69ad-4b43-b7d8-111eefb6802b/newak.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA941 5564 bytes
SHA-256: 7a9c116c12c78e8ecf2a3afe69dc7fcb2ea9c53b3da7cca304ab08c66fef3115
font_01_sfnt_off0000bc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4F 9816 bytes
SHA-256: 5dc35d964ef9bd64d86b01a8de7735465caf2e0e3b18c8caa681b1be1066f5bc
font_02_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 17752 bytes
SHA-256: 1d9fc2bb7c281a64543f4a3b15977263dcaddc665827f0a8e8ea9858a03f1a7a

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